"dd" block size question

[Gururajan Ramachandran <gururajan20815@yahoo.com>]

Hello,

If I want to clone a hard disk drive using "dd", can I
just use an arbitrarily large block size to speed up
the process?

For example,

dd if=/dev/hda bs=32768k of=/dev/hdc

or is the block size dependent on something and has to
be carefully chosen?

What block size should I choose to clone a 40GB drive?
If the number is dependent on the hard drive, how can
I get this info from a running system without shutting
it down and manually looking at the hard drive? My
system is Debian Woody.

Thanks,

Guru



		
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